Operating System (OS)
Sleep is a good mode to use because

It consumes low battery when you start it again
It saves power which in true is saving money
All of the listed here
It makes computer fresh after it wakes up

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Operating System (OS)
Scheduling is

None of these
not required in uniprocessor systems
unrelated to performance consideration
allowing jobs to use the processor
the same regard-less of the purpose of the system

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